(c)
Freundlisch adsorption isotherm is :
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \frac{X}{m} = KP^{1/n}$
If $P \longrightarrow 0;$ $\ \ \ \ \ \ n = 1\ \ \ \ \ \ \ \ \ \ \frac{X}{m} = KP$
$If\ P\ is\ high;\ \ \ \ n = 0\ \ \ \ \ \ \ \ \ \frac{X}{m} = KP^{0}$